300-070 Question #67: Real Exam Question with Answer & Explanation

The correct answer is C: isdn switch-type primary-ni. A properly configured T1 digital voice interface (PRI - Primary Rate Interface) requires the ISDN switch type to be set to match the service provider's switch. The command 'isdn switch-type primary-ni' specifies the National ISDN (NI) switch type, which is the most common PRI swi

Question

Which configuration output indicates a properly configured T1 digital voice interface?

Options

Acontroller T1 0/0/0
Bisdn switch-type primary-ni
Cisdn switch-type primary-ni
Disdn switch-type primary-ni

Explanation

A properly configured T1 digital voice interface (PRI - Primary Rate Interface) requires the ISDN switch type to be set to match the service provider's switch. The command 'isdn switch-type primary-ni' specifies the National ISDN (NI) switch type, which is the most common PRI switch type used in North America. This command is required on the router's serial or T1 controller interface to establish proper ISDN PRI signaling. Without the correct switch type, the D-channel will not come up and calls will fail. While a 'controller T1 0/0/0' stanza is also needed, the isdn switch-type command is the key indicator of a properly configured digital voice interface.

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